In 1931, the USGS established a statewide network of wells in Pennsylvania to monitor water-level fluctuations. This network consists of 68 wells to monitor ground water conditions during droughts. Links to ground-water data, hydrographs, and levels.

Lead page for detailed United States surface water information with links to real-time and historic streamflow data, suspended sediment data, USGS programs and facilities, publications, techniques, and featured news releases.

Over 30 years of substantial warming, the timing of life cycle events in maize here has changed, threatening the crop yield by exposing the plant at sensitive phases in its life cycle to increased heat and drought, and lowering the weight of its grains.

USGS water resources home page for Idaho with links to detailed hydrologic studies and real-time and long-term data on streamflow, ground and surface water, water quality, and water use, plus drought watch and relevant publications.

USGS water resources home page for Illinois with links to detailed hydrologic studies and real-time and long-term data on streamflow, ground and surface water, droughts, flooding, and water quality with highlights and project information.

USGS water resources home page for Kansas with links to detailed hydrologic studies and real-time and historical data on streamflow, ground and surface water, and water quality plus flood watch, drought watch, publications, and district news.

USGS water resource home page for Massachusetts and Rhode Island with detailed hydrologic studies and historic and real-time data on streamflow, ground and surface water, basins, floods, droughts, and water quality, plus district news.

USGS water resources home page for Michigan with links to detailed hydrologic studies and historic and real-time data on streamflow, ground and surface water, weather, water management, droughts, floods, and water quality.

USGS water resources home page for Montana with links to detailed hydrologic studies and historic and real-time data on streamflow, ground and surface water, floods, and water quality plus publications and district information.